package com.ailanyin.common.database.interceptor;

import org.apache.ibatis.cache.CacheKey;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.springframework.stereotype.Component;

import java.lang.reflect.Field;
import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
import java.util.regex.Matcher;

/**
 * @author ailanyin
 * @version 1.0
 * @since 2022/9/22 0022 上午 10:32
 */
@Intercepts(
        {
                @Signature(type = Executor.class, method = "query" , args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class}),
                @Signature(type = Executor.class, method = "query" , args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class}),
                @Signature(type = Executor.class, method = "update" , args = {MappedStatement.class, Object.class}),
        }
)
@Component
public class MybatisSqlLogInterceptor implements Interceptor {
    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        Object proceed = invocation.proceed();
        // 获取xml中的一个select/update/insert/delete节点，是一条SQL语句
        MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
        Object parameter = null;
        // 获取参数，if语句成立，表示sql语句有参数，参数格式是map形式
        if (invocation.getArgs().length > 1) {
            parameter = invocation.getArgs()[1];
        }
        // BoundSql就是封装myBatis最终产生的sql类
        BoundSql boundSql = mappedStatement.getBoundSql(parameter);
        // 获取节点的配置
        Configuration configuration = mappedStatement.getConfiguration();
        // 获取到最终的sql语句
        String sql = showSql(configuration, boundSql);
        // 获取到节点的id,即sql语句的id
        String sqlId = mappedStatement.getId();
        showSql(sql, sqlId);
        return proceed;
    }

    private void showSql(String sql, String sqlId) {
        System.out.println("===========================================================");
        System.out.println();
        System.out.println(sqlId);
        System.out.println();
        System.out.println(sql);
        System.out.println();
        System.out.println("===========================================================");
    }

    /**
     * 如果参数是String，则添加单引号，
     * 如果是日期，则转换为时间格式器并加单引号；
     * 对参数是null和不是null的情况作了处理
     */
    private static String getParameterValue(Object obj) {
        String value;
        if (obj instanceof String) {
            value = "'" + obj.toString() + "'";
        } else if (obj instanceof Date) {
            DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT,
                    DateFormat.DEFAULT, Locale.CHINA);
            value = "'" + formatter.format(new Date()) + "'";
        } else {
            if (obj != null) {
                value = obj.toString();
            } else {
                value = "";
            }
        }
        return value;
    }

    /**
     * 进行？的替换
     *
     * @param configuration
     * @param boundSql
     * @return
     */
    public String showSql(Configuration configuration, BoundSql boundSql) throws NoSuchFieldException, IllegalAccessException {
        // 获取参数
        Object parameterObject = boundSql.getParameterObject();
        List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
        // sql语句中多个空格都用一个空格代替
        String sql = getRealSql().replaceAll("[\\s]+" , " ");
        if (parameterObject != null) {
            // 获取类型处理器注册器，类型处理器的功能是进行java类型和数据库类型的转换
            TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
            // 如果根据parameterObject.getClass(）可以找到对应的类型，则替换
            if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
                sql = sql.replaceFirst("\\?" ,
                        Matcher.quoteReplacement(getParameterValue(parameterObject)));

            } else {
                // MetaObject主要是封装了originalObject对象，提供了get和set的方法用于获取和设置originalObject的属性值,主要支持对JavaBean、Collection、Map三种类型对象的操作
                MetaObject metaObject = configuration.newMetaObject(parameterObject);
                for (ParameterMapping parameterMapping : parameterMappings) {
                    String propertyName = parameterMapping.getProperty();
                    if (metaObject.hasGetter(propertyName)) {
                        Object obj = metaObject.getValue(propertyName);
                        sql = sql.replaceFirst("\\?" ,
                                Matcher.quoteReplacement(getParameterValue(obj)));
                    } else if (boundSql.hasAdditionalParameter(propertyName)) {
                        // 该分支是动态sql
                        Object obj = boundSql.getAdditionalParameter(propertyName);
                        sql = sql.replaceFirst("\\?" ,
                                Matcher.quoteReplacement(getParameterValue(obj)));
                    } else {
                        // 打印出缺失，提醒该参数缺失并防止错位
                        sql = sql.replaceFirst("\\?" , "缺失");
                    }
                }
            }
        }

        return sql;
    }

    /**
     * 获取真实sql, mybatis将其存在ThreadLocal中
     *
     * @return
     * @throws IllegalAccessException
     * @throws NoSuchFieldException
     */
    private String getRealSql() throws IllegalAccessException, NoSuchFieldException {
        Field field = ErrorContext.class.getDeclaredField("sql");
        field.setAccessible(true);
        Object sql = field.get(ErrorContext.instance());
        if (sql != null) {
            return sql.toString();
        }
        return "";
    }


    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

    @Override
    public void setProperties(Properties properties) {
    }
}
